diff --git a/README.md b/README.md
index b1c9040..6495f9a 100644
--- a/README.md
+++ b/README.md
@@ -273,4 +273,4 @@ conf.probe.target=/srv/statoolinfos/well-known/statoolinfos/foo.bar.org-metrics.
 conf.probe.httpaccesslog.pattern=
 ```
 
-Warning: to have month metric values, you have to set retention log to *7 weeks or 50 days in nginx or Apache logrotate* configuration.
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+Warning: to have month metric values, you have to set retention log to **7 weeks or 50 days in nginx or Apache logrotate** configuration.
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